Social media sharing

I'm using the block "Share this page!" and it has 7 social media icons which I can enable or disable. However, some are not well-known here in the US like VKontakte, odnoklassniki, and mailru. Is there a way to replace those with others of my choice?

I did click on the unwanted socicon but it doesn't allow it to be changed. The only thing that can be changed is from the blue gear which is to enable or disable. This block "Share this page" is different from the other block which does allow me to edit the socion and edit the link. This sharing block only allows enable or disable the preset socicons.